Billie Lourd Sang "American Girl" in the Bathtub for Her Late Mother Carrie Fisher's Birthday "I like to celebrate her by doing things that she loved to do." By Sara Delgado.

Why This Video of a Girl Signing in a Bathtub Went Viral. By Marina Liao. Updated on July 7, 2015 at 4:03 PM. You won't need to turn the sound on to watch this powerful video.